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Debt (Tables)
 12 Months Ended
Dec. 31, 2021
Debt Disclosure [Abstract]  
Schedule of Debt The Company’s short and long-term debt consists of the following:
As of December 31
(Dollars in millions)20212020
Short-Term Debt:
Short-term borrowings$3 $4 
Long-Term Debt:
4.00% Convertible Senior Notes due 2024 (Carrying value)
179 170 
Other long-term borrowings5 7 
Total Debt$187 $181 
The following table presents the outstanding principal amount and carrying value of the Notes:
4.00% Convertible Senior Notes due 2024
As of December 31
(Dollars in millions)20212020
Principal amount (face value)$207 $207 
Unamortized issuance cost(3)(4)
Unamortized debt discount(25)(33)
Net Carrying value$179 $170